CN214269510U

CN214269510U - Double-sided double-color printing machine capable of enabling paper not to be prone to wrinkling

Info

Publication number: CN214269510U
Application number: CN202120188903.2U
Authority: CN
Inventors: 张琦; 陶志中; 张品吉
Original assignee: Changshu Culture Printing Co ltd
Current assignee: Changshu Culture Printing Co ltd
Priority date: 2021-01-22
Filing date: 2021-01-22
Publication date: 2021-09-24
Anticipated expiration: 2031-01-22

Abstract

The utility model relates to a make two-sided double-colored printing machine of difficult fold of paper, belong to the printing machine field, it includes support and working seat, the working seat is connected with the support and is located the top of support, the working seat is equipped with the feed inlet, feed inlet department is equipped with paper feed mechanism, the place ahead of feed inlet is provided with leveling mechanism, leveling mechanism includes the support, workstation and cardboard, the workstation level is placed in the support top, the cardboard is connected with the workstation, the length direction of cardboard is perpendicular with the central axis direction of first rotation roller, the one end of keeping away from the feed inlet on the workstation is equipped with paper feeding mechanism. This application has and to make the difficult fold of paper, improves the effect of paper printing quality.

Description

Double-sided double-color printing machine capable of enabling paper not to be prone to wrinkling

Technical Field

The application relates to the field of printing machines, in particular to a double-sided double-color printing machine enabling paper to be difficult to wrinkle.

Background

Printing machines are machines for printing text and images, and generally comprise mechanisms for printing plates, inking, stamping, feeding paper, etc. Along with the development of science and technology, the type and the function of printing machine tend to the diversification, and the printing of present printed matter adopts two-sided double-color printing machine more, and two-sided double-color printing machine can print and color the both sides of printed matter simultaneously, improves the printing efficiency to the printed matter greatly.

At present, a paper feeding mechanism of a duplex two-color printing machine generally comprises two rotating rollers with tangent outer circumferential surfaces, and the rotating rollers rotate to convey paper in a paper storage box to an inner printing area of the duplex two-color printing machine for printing.

The related art has a disadvantage that when the paper in the paper storage box is not placed uniformly, the length of the rotating roller is consistent, so the paper conveyed by the rotating roller is wrinkled, and the printing effect of the paper at the later stage is poor.

SUMMERY OF THE UTILITY MODEL

In order to reduce the wrinkle rate of paper, the application provides a double-sided double-color printing machine which enables the paper not to be easily wrinkled.

The application provides a pair of make two-sided double-color printing machine of difficult fold of paper adopts following technical scheme:

a double-sided double-color printing machine enabling paper not to be prone to wrinkling comprises a printing machine body, the printing machine body comprises a support and a working seat, the working seat is connected with the support and located above the support, a feed port is formed in the working seat, a paper conveying mechanism is arranged at the feed port and comprises a first rotating roller and a second rotating roller, the central axis of the first rotating roller is parallel to the central axis of the second rotating roller, the outer circumferential surfaces of the first rotating roller and the second rotating roller are tangent, the first rotating roller and the second rotating roller are both rotatably connected with the working seat, a rotating motor used for driving the first rotating roller to rotate is arranged on the working seat, a flattening mechanism is arranged in front of the feed port and comprises a support, a working table, a first paperboard clamping plate and a second paperboard clamping plate, the working table is horizontally placed above the support, the first paperboard clamping plate and the second paperboard clamping plate are parallel to each other and are both connected with the working table, the length direction of the first cardboard is perpendicular to the central axis direction of the first rotating roller, and one end of the workbench, which is far away from the feed inlet, is provided with a paper feeding mechanism.

Through adopting above-mentioned technical scheme, will treat that the printing paper is placed between first cardboard and the second cardboard in workstation top, first cardboard and second cardboard can make the paper neatly get arranged at paper feed mechanism's dead ahead, and at the in-process that paper feed mechanism carried the paper to paper feed mechanism, the paper is difficult for taking place the skew and lead to the paper slope, and then makes the paper that gets into in the paper feed mechanism be difficult for being pressed the fold to promote the printing quality of paper.

Optionally, a first T-shaped groove is formed above the workbench, the length direction of the first T-shaped groove is consistent with the direction of the central axis of the first rotating roller, a first T-shaped sliding block in sliding fit with the first T-shaped groove is fixedly connected to the bottom of the first cardboard, and a first driving piece for driving the first T-shaped sliding block to move towards the direction close to or away from the second cardboard is arranged on the workbench.

Through adopting above-mentioned technical scheme, with the inner wall butt of a lateral wall of paper and second cardboard, first driving piece drive first cardboard to the direction reciprocating motion that is close to or keeps away from the second cardboard. The paper can be quickly flattened.

Optionally, a second T-shaped groove is formed above the workbench, the length direction of the second T-shaped groove is consistent with the direction of the central axis of the first rotating roller, a second T-shaped sliding block in sliding fit with the second T-shaped groove is fixedly connected to the bottom of the second cardboard, and a second driving piece for driving the second T-shaped sliding block to move towards or away from the first cardboard is arranged on the workbench.

Through adopting above-mentioned technical scheme, when driving the second cardboard to the direction that is close to or keeps away from the second cardboard through the second driving piece and remove, the second cardboard uses with first cardboard mutually supporting can make the levelling mechanism be applicable to different width papers, improves the suitability of levelling mechanism.

Optionally, a first sliding groove is vertically formed in the side wall of the working seat, a first sliding block is connected to the side wall of the second rotating roller in a rotating mode, the first sliding block is connected with the first sliding groove in a sliding mode, an elastic piece used for driving the second rotating roller to vertically move is arranged between the first sliding block and the first sliding groove, and the elastic piece is in a compression state.

Through adopting above-mentioned technical scheme, the second live-rollers can be often under the elastic force effect of elastic component with the lower surface butt of paper, make the paper that gets into between first live-rollers and the second live-rollers level and smooth, also can make the difficult emergence skew of paper position, and then make the difficult fold that produces of paper that gets into in the work seat, make the printing machine body carry out the accurate printing to the paper, and then improve the printing quality of printing machine body to the paper.

Optionally, a telescopic rod is arranged inside the elastic piece, the telescopic rod comprises an insertion rod and a telescopic cylinder, the bottom wall of the telescopic cylinder is fixedly connected with the bottom wall of the first sliding groove, the other end of the telescopic cylinder is sleeved outside the insertion rod and is vertically and slidably connected with the insertion rod, and one end of the insertion rod, far away from the telescopic cylinder, is fixedly connected with the bottom wall of the first sliding block.

Through adopting above-mentioned technical scheme, the telescopic link restricts the degree of freedom of elastic component on the horizontal direction, makes the second live-rollers can vertical steady removal, and then makes the paper be difficult for taking place the displacement on the horizontal direction, helps making the fold rate of paper reduce, promotes the printing quality of paper.

Optionally, paper feeding mechanism includes the support frame and the roller of form advancing, and the vertical setting of support frame is in the workstation top, and the roller of form advancing rotates with the support frame to be connected, and the central axis of the roller of form advancing is parallel with the central axis of first live-rollers, and the roller of form advancing is located between first cardboard and the second cardboard, is equipped with on the support frame to be used for driving paper advance roller pivoted rotating electrical machines.

By adopting the technical scheme, when the outer circumferential surface of the paper feeding roller is abutted against the paper above the workbench, the output shaft of the rotating motor rotates to drive the paper feeding roller to rotate, and the friction force between the outer circumferential surface of the paper feeding roller and the upper surface of the paper can push the paper to move towards the paper conveying mechanism to finish the paper conveying process.

Optionally, the second spout has been seted up to the inner wall of support frame, the lateral wall of the roller of form advancing rotates and is connected with the second slider with the vertical sliding fit of second spout, the outer wall intercommunication of second spout and support frame, rotating electrical machines's output shaft and second slider fixed connection and with the vertical sliding connection of support frame, the support frame is equipped with and is used for the drive to advance the roller to the third driving piece that is close to or keeps away from the direction removal of workstation.

Through adopting above-mentioned technical scheme, the third driving piece can drive the vertical slip of second slider in the second spout, and then can make the roller of form advancing vertical slip on the support frame to can finely tune the distance of roller of form advancing to the workstation upper surface, make the roller of form advancing adapt to the paper of different thickness.

Optionally, the third driving part includes a lead screw and a driving motor, the lead screw is arranged on the second slider in a penetrating manner and is in threaded connection with the second slider, an output shaft of the driving motor penetrates through a top wall of the support frame and is fixedly connected with the lead screw, and the lead screw is connected with the support frame in a rotating manner.

Through adopting above-mentioned technical scheme, driving motor's output shaft rotates and drives the lead screw and rotate, and the lead screw rotates and drives the vertical removal of second slider, and then makes the roller vertical slip of form advancing, and the drive mode is simple and convenient.

To sum up, the application comprises the following beneficial technical effects:

1. the first cardboard plate and the second cardboard plate are arranged on the workbench at the feed inlet, so that paper to be printed is placed between the first cardboard plate and the second cardboard plate, the first cardboard plate and the second cardboard plate can enable the paper to be kept orderly in the paper feeding direction all the time, the paper entering the working seat is not easy to be folded by the paper feeding mechanism, the printing effect of the paper is poor, and the paper has better printing quality by reducing the folding rate of the paper;

2. the first cardboard plate and the second cardboard plate can be close to or far away from each other above the workbench, so that paper with different sizes can be placed above the workbench, and the paper above the workbench can be leveled quickly;

3. the elastic piece is arranged below the second rotating roller, so that the first rotating roller and the second rotating roller can tightly support paper at all times, the paper is not easy to deviate, the paper entering the working seat is not easy to wrinkle, and the printing quality of the paper is improved.

Drawings

FIG. 1 is a schematic perspective view of an embodiment of the present application;

FIG. 2 is a schematic perspective view of a leveling mechanism according to an embodiment of the present disclosure;

fig. 3 is a schematic perspective view illustrating a telescopic rod according to an embodiment of the present disclosure.

Description of reference numerals: 1. a printer body; 11. a support; 12. a working seat; 122. a feed inlet; 212. a first chute; 3. a paper feed mechanism; 31. a first rotating roller; 32. a second rotating roller; 33. rotating the motor; 35. a first slider; 36. a spring; 37. a telescopic rod; 371. inserting the rod; 372. a telescopic cylinder; 4. a leveling mechanism; 41. a support; 42. a work table; 421. a first T-shaped groove; 422. a second T-shaped groove; 423. a first cylinder; 424. a second cylinder; 43. a first cardboard sheet; 44. a second cardboard; 5. a paper feeding mechanism; 51. a support frame; 511. a second chute; 52. a paper feed roller; 53. a rotating electric machine; 54. a second slider; 55. a third driving member; 551. a lead screw; 552. the motor is driven.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

The embodiment of the application discloses a double-sided double-color printing machine enabling paper to be not prone to wrinkling. Referring to fig. 1, a two-sided double-color printing machine that makes difficult fold of paper includes printing machine body 1, and printing machine body 1 includes support 11 and working seat 12, and support 11 level is placed subaerial, and the upper surface fixed connection of working seat 12 level and support 11, feed inlet 122 has been seted up to a lateral wall of working seat 12, and feed inlet 122 department is equipped with paper feed mechanism 3, and the place ahead of feed inlet 122 is provided with leveling mechanism 4, and the one side of keeping away from feed inlet 122 of leveling mechanism 4 is equipped with paper feeding mechanism 5. The paper to be printed is placed in the leveling mechanism 4, the leveling mechanism 4 can quickly enable the paper to be arranged in the right front of the paper conveying mechanism 3 in order, the paper feeding mechanism 5 conveys the paper to the paper conveying mechanism 3, in the process, the leveling mechanism 4 can enable the paper to be not prone to tilting, therefore, the paper entering the paper conveying mechanism 3 is not prone to being pressed and folded, the paper conveying mechanism 3 can enable the paper to be not prone to shifting in the process of conveying the paper from the feeding hole 122 to the working seat 12, the accurate printing of the paper by the printing machine body 1 is facilitated, and the printing quality of the paper by the printing machine body 1 is improved.

As shown in fig. 1, the paper feeding mechanism 5 includes a support frame 51, a paper feeding roller 52 and a rotating motor 53, the support frame 51 is vertically arranged and fixed relative to the ground, the paper feeding roller 52 is rotatably connected to the support frame 51, and the outer circumferential surface of the paper feeding roller 52 abuts against the paper above the table 42. When the outer circumference of the paper feeding roller 52 abuts against the paper above the table 42, the output shaft of the rotating motor 53 rotates to drive the paper feeding roller 52 to rotate, and the friction force between the outer circumference of the paper feeding roller 52 and the upper surface of the paper can push the paper to move towards the paper feeding mechanism 3 to complete the paper feeding process.

Referring to fig. 1, a second sliding groove 511 is vertically formed in a side wall of the supporting frame 51, the second sliding groove 511 penetrates through the wall thickness of the supporting frame 51, the paper feeding roller 52 is rotatably connected with a second sliding block 54 through a rotating shaft, the second sliding block 54 is vertically in sliding fit with the second sliding groove 511, and an output shaft of the rotating motor 53 is fixedly connected with the side wall of the second sliding block 54 and is vertically in sliding connection with the supporting frame 51. The supporting frame 51 is provided with a third driving member 55 for driving the paper feeding roller 52 to vertically move, the third driving member 55 comprises a lead screw 551 and a driving motor 552, the lead screw 551 is arranged on the second slider 54 in a penetrating manner and is in threaded connection with the second slider 54, an output shaft of the driving motor 552 penetrates through the top wall of the supporting frame 51 and then is fixedly connected with one end of the lead screw 551, and the lead screw 551 is connected with the supporting frame 51 in a rotating manner. The output shaft of the driving motor 552 rotates to drive the lead screw 551 to rotate, and the lead screw 551 drives the second slider 54 to vertically move in the second sliding slot 511, so that the paper feeding roller 52 vertically slides on the supporting frame 51, the purpose of fine-tuning the distance between the paper feeding roller 52 and the surface of paper is achieved, and the paper feeding roller 52 is adapted to paper with different thicknesses.

As shown in fig. 1, the leveling mechanism 4 includes a support 41, a workbench 42, a first cardboard plate 43 and a second cardboard plate 44, the support 41 is horizontally placed on the ground, the workbench 42 is horizontally placed above the support 41, one end of the workbench 42 is located at the feed port 122 and is flush with the feed port 122, the other end is fixedly connected with the bottom of the support frame 51, the first cardboard plate 43 and the second cardboard plate 44 are parallel to each other and are fixedly connected with the workbench 42, the first cardboard plate 43 and the second cardboard plate 44 are both vertically arranged, the length direction of the first cardboard plate 43 and the length direction of the second cardboard plate 44 are both perpendicular to the central axis direction of the paper feeding roller 52, and the paper feeding roller 52 is located between the first cardboard plate 43 and the second cardboard plate 44. The paper to be printed is placed between the first cardboard plate 43 and the second cardboard plate 44 above the workbench 42, the first cardboard plate 43 and the second cardboard plate 44 can enable the paper to be neatly arranged right ahead of the paper feeding mechanism 3, when the paper feeding roller 52 rotates, the paper is always located between the first cardboard plate 43 and the second cardboard plate 44, the paper is enabled not to be prone to offset, and then the paper entering the paper feeding mechanism 3 is enabled not to be prone to being pressed and wrinkled.

Referring to fig. 2, a first T-shaped groove 421 and a second T-shaped groove 422 are formed above the workbench 42, the length directions of the first T-shaped groove 421 and the second T-shaped groove 422 are both consistent with the central axis direction of the first rotating roller 31, a first T-shaped slider slidably engaged with the first T-shaped groove 421 is fixedly connected to the bottom of the first cardboard 43, a first driving member for driving the first T-shaped slider to move in a direction close to or away from the second cardboard 44 is disposed on the workbench 42, the first driving member is a first cylinder 423, the side wall of the first cylinder 423 is fixedly connected to the workbench 42, the piston rod of the first cylinder 423 is fixedly connected to the outer side wall of the first cardboard 43, a second T-shaped slider slidably engaged with the second T-shaped groove 422 is fixedly connected to the bottom of the second cardboard 44, a second driving member for driving the second T-shaped slider to move in a direction close to or away from the first cardboard 43 is disposed on the workbench 42, the second driving member is a second cylinder 424, a side wall of the second cylinder 424 is fixedly connected with the working table 42, and a piston rod of the second cylinder 424 is fixedly connected with an outer side wall of the second cardboard 44. The first cylinder 423 and the second cylinder 424 are driven to enable the first cardboard plate 43 and the second cardboard plate 44 to approach or separate from each other, so that the leveling mechanism 4 is suitable for paper with different widths, and when one of the first cardboard plate 43 or the second cardboard plate 44 is fixed and abuts against one side wall of the paper, the other is moved back and forth, which is beneficial to quickly leveling the paper.

Referring to fig. 2 and 3, the paper feeding mechanism 3 includes a first rotating roller 31, a second rotating roller 32 and a rotating motor 33, the central axes of the first rotating roller 31, the second rotating roller 32 and the paper feeding roller 52 are all parallel to each other, the outer circumferential surfaces of the first rotating roller 31 and the second rotating roller 32 are tangent to each other, the first rotating roller 31 and the second rotating roller 32 are both rotatably connected to the work base 12, the rotating motor 33 penetrates through the sidewall of the work base 12 and then is fixedly connected to the first rotating roller 31, the sidewall of the work base 12 is vertically provided with a first sliding slot 212, the sidewall of the second rotating roller 32 is rotatably connected to a first sliding block 35, the first sliding block 35 is vertically slidably connected to the first sliding slot 212, an elastic member for driving the second rotating roller 32 to vertically move is arranged between the first sliding block 35 and the first sliding slot 212, the elastic member is a spring 36, the spring 36 vertically extends and retracts and is in a compressed state, one end of the spring 36 is fixedly connected to the bottom wall of the first sliding slot 212, the other end and the diapire fixed connection of first slider 35, the inside telescopic link 37 that is equipped with of spring 36, telescopic link 37 is including inserting pole 371 and telescopic cylinder 372, the diapire fixed connection of telescopic cylinder 372 and first spout 212, and the other end cover is established and is inserted the outside of establishing pole 371 and with insert the vertical sliding connection of establishing pole 371, insert the diapire fixed connection of establishing the pole 371 one end and first slider 35 of keeping away from telescopic cylinder 372. Second live-rollers 32 can be often with the lower surface butt of paper under spring 36's elasticity effect, first live-rollers 31 can make the paper level and smooth with the cooperation of second live-rollers 32, and make the difficult emergence offset of the in-process of paper entering working seat 12, thereby reduce the fold rate of paper, promote the printing quality of printing machine body 1 to the paper, in this process, telescopic link 37 limits spring 36 the degree of freedom on the horizontal direction, make second live-rollers 32 can vertical steady movement, make second live-rollers 32 exert the performance better.

The implementation principle of the double-sided double-color printing machine for preventing paper from being wrinkled in the embodiment of the application is as follows: place the paper level on workstation 42, utilize levelling mechanism 4 to make the paper align fast on workstation 42, then adjust the height of paper feed roller 52, rotating electrical machines 53 drive paper feed roller 52 rotates, carry the paper of workstation 42 top to paper feed mechanism 3, in transportation process, because the both sides wall of paper is at times with first cardboard 43 and second cardboard 44 butt, the difficult slope that takes place in workstation 42 top of the paper, paper feed mechanism 3 carries the interior printing of paper work seat 12, paper feed mechanism 3 makes the difficult position skew that takes place of paper that gets into in work seat 12, thereby reduce the fold rate of paper, promote the printing quality of printing machine body 1 to the paper.

By arranging the first cardboard plate 43 and the second cardboard plate 44 on the workbench 42 at the feed inlet 122, paper to be printed is placed between the first cardboard plate 43 and the second cardboard plate 44, the first cardboard plate 43 and the second cardboard plate 44 can keep the paper orderly in the paper feeding direction all the time, so that the paper entering the workbench 12 is not easy to be crumpled by the paper feeding mechanism 3, the printing effect of the paper is poor, and the paper has better printing quality.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a make difficult two-sided double-colored printing machine of fold of paper, including printing machine body (1), printing machine body (1) includes support (11) and working seat (12), working seat (12) are connected and are located the top of support (11) with support (11), working seat (12) are equipped with feed inlet (122), feed inlet (122) department is equipped with paper feeding mechanism (3), paper feeding mechanism (3) are including first live-rollers (31) and second live-rollers (32), the central axis of first live-rollers (31) is parallel with the central axis of second live-rollers (32), the outer periphery of first live-rollers (31) and second live-rollers (32) is tangent, first live-rollers (31) all rotate with working seat (12) with second live-rollers (32) and be connected, be equipped with on working seat (12) and be used for driving first live-rollers (31) pivoted rotation motor (33), its characterized in that: the place ahead of feed inlet (122) is provided with levelling mechanism (4), levelling mechanism (4) are including support (41), workstation (42), first cardboard (43) and second cardboard (44), workstation (42) level is placed in support (41) top, first cardboard (43) and second cardboard (44) are parallel to each other and all are connected with workstation (42), the length direction of first cardboard (43) is perpendicular with the central axis direction of first rotation roller (31), the one end of keeping away from feed inlet (122) on workstation (42) is equipped with paper feeding mechanism (5).

2. A perfecting bicolor printing press which renders the sheets less prone to cockling as claimed in claim 1, wherein: first T type groove (421) have been seted up to the top of workstation (42), and the length direction in first T type groove (421) is unanimous with the central axis direction of first rotation roller (31), and the bottom fixedly connected with of first cardboard (43) and the first T type slider of sliding fit in first T type groove (421), be equipped with on workstation (42) and be used for driving first T type slider to being close to or keeping away from the first driving piece that the direction of second cardboard (44) removed.

3. A perfecting bicolor printing press which renders the sheets less prone to cockling as claimed in claim 2, wherein: second T type groove (422) have been seted up to the top of workstation (42), and the length direction in second T type groove (422) is unanimous with the central axis direction of first rotation roller (31), and the bottom fixedly connected with of second cardboard (44) slides complex second T type slider in second T type groove (422), is equipped with on workstation (42) to be used for driving second T type slider to being close to or keeping away from the second driving piece that the direction of first cardboard (43) removed.

4. A perfecting bicolor printing press which renders the sheets less prone to cockling as claimed in claim 1, wherein: first spout (212) have vertically been seted up to the lateral wall of work seat (12), and the lateral wall of second live-rollers (32) rotates and is connected with first slider (35), and vertical sliding connection of first slider (35) and first spout (212) is equipped with the elastic component that is used for driving second live-rollers (32) vertical movement between first slider (35) and first spout (212), and the elastic component is in compression state.

5. A perfecting bicolor printing press which renders the sheets less prone to wrinkling according to claim 4, wherein: the elastic component is inside to be equipped with telescopic link (37), and telescopic link (37) are including inserting pole (371) and telescopic cylinder (372), the diapire of telescopic cylinder (372) and the diapire fixed connection of first spout (212), and the other end cover is established and is inserted the outside of establishing pole (371) and with insert the vertical sliding connection of establishing pole (371), insert the diapire fixed connection of establishing pole (371) and keeping away from one end of telescopic cylinder (372) and first slider (35).

6. A perfecting bicolor printing press which renders the sheets less prone to cockling as claimed in claim 1, wherein: the paper feeding mechanism (5) comprises a support frame (51) and a paper feeding roller (52), the support frame (51) is vertically arranged above the workbench (42), the paper feeding roller (52) is rotatably connected with the support frame (51), the central axis of the paper feeding roller (52) is parallel to the central axis of the first rotating roller (31), the paper feeding roller (52) is positioned between the first cardboard (43) and the second cardboard (44), and a rotating motor (53) used for driving the paper feeding roller (52) to rotate is arranged on the support frame (51).

7. A perfecting bicolor printing press which renders the sheets less prone to cockling as claimed in claim 6, wherein: second spout (511) have been seted up to the inner wall of support frame (51), the lateral wall of paper feed roller (52) rotates and is connected with second slider (54) with the vertical sliding fit of second spout (511), the outer wall intercommunication of second spout (511) and support frame (51), the output shaft of rotating electrical machines (53) and second slider (54) fixed connection and with the vertical sliding connection of support frame (51), support frame (51) are equipped with and are used for driving paper feed roller (52) to being close to or keeping away from third driving piece (55) that the direction of workstation (42) removed.

8. A perfecting bicolor printing press which renders the sheets less prone to cockling as claimed in claim 7, wherein: the third driving piece (55) comprises a lead screw (551) and a driving motor (552), the lead screw (551) penetrates through the second sliding block (54) and is in threaded connection with the second sliding block (54), an output shaft of the driving motor (552) penetrates through the top wall of the support frame (51) and then is fixedly connected with the lead screw (551), and the lead screw (551) is rotatably connected with the support frame (51).